Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c957ae0027fa304…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 14:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eaf943583de3026b9d265c43258b51ab SHA-1: f511629a3b6f1608e6e1bbbc949d7374da3c0b69 SHA-256: 3c957ae0027fa304bc180ce0cd0eb2638082acf64dd6a3f9b436503b1f5e4ea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://boatmonies.com/uploads/files/derunexobitukema.pdf In PDF document text
    • https://888nv.ru/userfiles/file/50450039906.pdfIn PDF document text
    • http://stroi-sistema.ru/img/2427611514.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lodaz.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/gokajujogolawola.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gawidomim.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/2552028545.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/sojixupefamotulorunizu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ccf59ed3---36860711907.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/pemeni.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/2625328507.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/jafeso.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/66072068956.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/61474581779.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/81858374598.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dc343c609643b515ec8e1fae4a13106d/vewirovaxu.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/kenimixaputijenatigedin.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0a308e69---jijatawarurijudumuxulegu.pdfIn PDF document text
    • http://prestopc.it/upload/file/mezutil.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/98986742626.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/70089509268.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/98132535565.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wakogalonirefemapi.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/1703446493.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4d2e19a8e3eb6424b48b8a0a30371710/joxadopeliwezufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+android+litePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 19352 bytes
SHA-256: d83d4e9e6b0f734a10ad10a898541c3e6115510d104a2a3b8e24d5a69d6a7d9a
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_02_sfnt_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13679 10244 bytes
SHA-256: 0b4f5e54e6e57fb5e36ec2795fde358b29c21787d2427f72c1b77a4c796ffbf7

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